Process of manufacturing briquets of ore, &amp;c.



' UNITED STATES 'PATENT'OFFIC-E. 1 v

, .H'Uoo SOHULTE-STEIVNBIERG, or DU'EREN Ber, STOOKUNL'VKREVIVS BOCHUM,

GERMANY. a 1

' i I Psoclss OFMANUFACTURINGIBRIQUEITS er -E, ac. 'l

Application filed February 25,1904. Serial No. 195,204.

To all whom it may concerns "Be it known that I, HUGO ScHUL'rE-STEIN- BERG, of Dueren bei Stockum, Kreis'Bochum, Westphalia, Germany, have invented certain new and useful Im rovements in Processes of Manufacturing Briquets Suitable to be Furnaced of any Metalliferous Refuse or Waste or Rotten Ores, of which the following is a specification.

The present invention relates to a process of manufacturing briquets for smelting and blast furnaces to reduce any metalliferous refuse or rotten ores, and has for its object, first,-to permit the metallurgical utilization of furnace refuse, rotten ores, or other metalliferous materials hitherto regarded as of no value, and, second, to dispense with the use of lime, hydraulic cement, or similar ingredients hitherto employed as binders in the manufacture of similar briquets.

In the different methods heretofore employed for the manufacture of such briquets ime, hydraulic cement, or similar matters were used as binders. These, however, impair the process of smelting and are unfit for the production of briquets with a certain degree of porosity, which is very desirable. The agglomeration of fine particles of ore has also been effected by mixmg'to it finely-comminuted ordinary slag andby subse uently applying heat in order to fuse the s ag so that the latter acts as a binder for the ore particles. A briquetobtained'in this way is a good commercial article, but is expensive on account of the fuel expended for fusing the slag. It is evident that a binder as a substi' tute for limestone, &c'., consisting of furnacesla should give excellent results.

The binding power of ground or otherwise comminuted or granular slag after a treatment with high-pressure steam in a' closed to retain their sha e in the furnace, while, on; the other hand, a high degree of porosity, tobe obtained by more or less sacrificing the hard-.

cylinder or retort is well known, and such binder has been used to manufacture artificial sandstone for building pur oses, having a high de cc of durability. e use of the same bin er for making briquets for smelting ur oses recommended itself; but certain di culties hadto be overcome, for the briquets requirea certain degree of hardness, so as to stand the handling, transportation, and

- Specification of Letters Patent.

. mated Oct. 9, 1906.

ness, is very desirable, so that-ior the chemical actions in all the zones of the furnace the fine particles are easily and everywhere fully exposed. In using too much of the binder briquets are obtained which, like the artificial sandstone above referred to, are very hard and useless for metallurgical reduction, because they form lumps in the furnace which are inaccessible to the chemical reactions.

In using the binder in too small quantities the briquets obtained are insufficient for handling, fall into powder, and the small arti-' cles of ore, dust, &c., are compelled to ollow the blast, leading to obstructions in the fur nace, to explosions, and other irregulari ties. After many experiments I have found that about ten per cent. is the most suitable quantity of the binder to be used with the metalliferous refuse in order to obtain briquets being sufiiciently hard and having a suitable porosity.

In pre aring the briquets the comminuted slag, pre erably white furnace-slag, is brought into a revolving cylinder to'be exposed therein in the well-known manner to a quick andthorough action of high-pressure steam. The said rotatory motion may be produced by any suitable means; After permitting the steam to act as long as'may be necessary up0n the slag itis withdrawn and is now a suitable binder.

the gases in thejulpper portion of the furnall p to diffuse throug the briquet and to bring about the desired chemical changes.

The

briquet obtained in this manner is physically;

different from the briquet agglomerated byf the fusion of slag, inasmuch as only ahydrau- IOC lic binding'holds the articles together sufiiciently to stand han mg and transportation.

The binding by fusion is obtained later inthe' high furnace, itself, where the heat destroys the hydraulic bindingandsubstitutes'for it;

the binding by fusion. Thus a great advan tage is obtained. All the fuel s ent in the manufacture of ordinary ore ri quets is saved, and in the melting zone of'the furnace v the briquets, being fritted together in the upper zones, preserve their shape, as well as porosity.

My rocess can be used for-briqueting any kind 0 ores or any waste or refuse containing binder is small compared with the other elements, being only sufiicient to enable the briquets to be handled without breaking',l'but sufficient to cause them to retain their shape sash and porosity when in use and prevent their falling intoowder;

What I c aim as my invention, anddesire to protect by United States Letters Patent, 1s v 1. A porous briquet suitable for meltingfurnaces com osed of finely-divided metalliferous material, and hydraulic slag cement,"

substantially as described.

2. A porous briquet suitable for meltingfurnaces composed of finely-divided metalliferous material, ten parts, and hydraulic slag cement, one part, substantially as described. y

In testimony whereof I have hereunto signed my name. in the presence of two witnesses. a

HUGO SCHU'LTE-STEINBERG. Witnesses: 1 WILLIAM EssENwEIN,

PETER LIEBER. 

